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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 // These must match with how the video and canvas tags are declared in html. | 5 // These must match with how the video and canvas tags are declared in html. |
6 const VIDEO_TAG_WIDTH = 320; | 6 const VIDEO_TAG_WIDTH = 320; |
7 const VIDEO_TAG_HEIGHT = 240; | 7 const VIDEO_TAG_HEIGHT = 240; |
8 | 8 |
9 // Fake video capture background green is of value 135. | 9 // Fake video capture background green is of value 135. |
10 const COLOR_BACKGROUND_GREEN = 135; | 10 const COLOR_BACKGROUND_GREEN = 135; |
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59 }, | 59 }, |
60 callback); | 60 callback); |
61 } | 61 } |
62 | 62 |
63 function detectVideo(videoElementName, predicate, callback) { | 63 function detectVideo(videoElementName, predicate, callback) { |
64 console.log('Looking at video in element ' + videoElementName); | 64 console.log('Looking at video in element ' + videoElementName); |
65 | 65 |
66 var width = VIDEO_TAG_WIDTH; | 66 var width = VIDEO_TAG_WIDTH; |
67 var height = VIDEO_TAG_HEIGHT; | 67 var height = VIDEO_TAG_HEIGHT; |
68 var videoElement = $(videoElementName); | 68 var videoElement = $(videoElementName); |
| 69 var canvas = $(videoElementName + '-canvas'); |
69 var oldPixels = []; | 70 var oldPixels = []; |
70 var startTimeMs = new Date().getTime(); | |
71 var waitVideo = setInterval(function() { | 71 var waitVideo = setInterval(function() { |
72 var canvas = $(videoElementName + '-canvas'); | |
73 if (canvas == null) { | |
74 console.log('Waiting for ' + videoElementName + '-canvas' + ' to appear'); | |
75 return; | |
76 } | |
77 var context = canvas.getContext('2d'); | 72 var context = canvas.getContext('2d'); |
78 context.drawImage(videoElement, 0, 0, width, height); | 73 context.drawImage(videoElement, 0, 0, width, height); |
79 var pixels = context.getImageData(0, 0 , width, height / 3).data; | 74 var pixels = context.getImageData(0, 0 , width, height / 3).data; |
80 // Check that there is an old and a new picture with the same size to | 75 // Check that there is an old and a new picture with the same size to |
81 // compare and use the function |predicate| to detect the video state in | 76 // compare and use the function |predicate| to detect the video state in |
82 // that case. | 77 // that case. |
83 if (oldPixels.length == pixels.length && | 78 if (oldPixels.length == pixels.length && |
84 predicate(pixels, oldPixels)) { | 79 predicate(pixels, oldPixels)) { |
85 console.log('Done looking at video in element ' + videoElementName); | 80 console.log('Done looking at video in element ' + videoElementName); |
86 clearInterval(waitVideo); | 81 clearInterval(waitVideo); |
87 callback(videoElement.videoWidth, videoElement.videoHeight); | 82 callback(videoElement.videoWidth, videoElement.videoHeight); |
88 } | 83 } |
89 oldPixels = pixels; | 84 oldPixels = pixels; |
90 | |
91 var elapsedTime = new Date().getTime() - startTimeMs; | |
92 if (elapsedTime > 3000) { | |
93 startTimeMs = new Date().getTime(); | |
94 console.log('Still waiting for video to satisfy ' + predicate.toString()); | |
95 } | |
96 }, 200); | 85 }, 200); |
97 } | 86 } |
98 | 87 |
99 function waitForVideoWithResolution(element, expected_width, expected_height) { | 88 function waitForVideoWithResolution(element, expected_width, expected_height) { |
100 addExpectedEvent(); | 89 addExpectedEvent(); |
101 detectVideoPlaying(element, | 90 detectVideoPlaying(element, |
102 function (width, height) { | 91 function (width, height) { |
103 assertEquals(expected_width, width); | 92 assertEquals(expected_width, width); |
104 assertEquals(expected_height, height); | 93 assertEquals(expected_height, height); |
105 eventOccured(); | 94 eventOccured(); |
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190 // pixels are changed. | 179 // pixels are changed. |
191 function isVideoPlaying(pixels, previousPixels) { | 180 function isVideoPlaying(pixels, previousPixels) { |
192 for (var i = 0; i < pixels.length; i++) { | 181 for (var i = 0; i < pixels.length; i++) { |
193 if (pixels[i] != previousPixels[i]) { | 182 if (pixels[i] != previousPixels[i]) { |
194 return true; | 183 return true; |
195 } | 184 } |
196 } | 185 } |
197 return false; | 186 return false; |
198 } | 187 } |
199 | 188 |
200 // Pixels is an array where pixels[0] is the R value for the first pixel, | |
201 // pixels[1] is the G value, and so on. | |
202 function isVideoBlack(pixels) { | 189 function isVideoBlack(pixels) { |
203 for (var i = 0; i < pixels.length; i++) { | 190 for (var i = 0; i < pixels.length; i++) { |
204 if ((i + 1) % 4 == 0) { | 191 // |pixels| is in RGBA. Ignore the alpha channel. |
205 // Ignore the alpha channel. | 192 // We allow it to be off by 1, to account for rounding errors in YUV |
206 continue; | 193 // conversion. |
207 } | 194 if (pixels[i] != 0 && pixels[i] != 1 && (i + 1) % 4 != 0) { |
208 | |
209 // A black pixel has 0 for R,G and B but allow a bit more here to account | |
210 // for rounding errors in libyuv. | |
211 if (pixels[i] > 3) { | |
212 console.log('Found nonblack pixel at ' + i + ', was ' + pixels[i]); | |
213 return false; | 195 return false; |
214 } | 196 } |
215 } | 197 } |
216 return true; | 198 return true; |
217 } | 199 } |
218 | 200 |
219 // This function matches |left| and |right| and fails the test if the | 201 // This function matches |left| and |right| and fails the test if the |
220 // values don't match using normal javascript equality (i.e. the hard | 202 // values don't match using normal javascript equality (i.e. the hard |
221 // types of the operands aren't checked). | 203 // types of the operands aren't checked). |
222 function assertEquals(expected, actual) { | 204 function assertEquals(expected, actual) { |
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240 if (device.kind == 'video') | 222 if (device.kind == 'video') |
241 hasVideoInputDevice = true; | 223 hasVideoInputDevice = true; |
242 }); | 224 }); |
243 | 225 |
244 if (hasVideoInputDevice) | 226 if (hasVideoInputDevice) |
245 sendValueToTest('has-video-input-device'); | 227 sendValueToTest('has-video-input-device'); |
246 else | 228 else |
247 sendValueToTest('no-video-input-devices'); | 229 sendValueToTest('no-video-input-devices'); |
248 }); | 230 }); |
249 } | 231 } |
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